首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Watching Microcurrents Flow We can now watch electricity as it flows through even the tiniest circuits. By scanning the magnetic
Watching Microcurrents Flow We can now watch electricity as it flows through even the tiniest circuits. By scanning the magnetic
admin
2009-06-15
122
问题
Watching Microcurrents Flow
We can now watch electricity as it flows through even the tiniest circuits. By scanning the magnetic field generated as electric currents flow through objects, physicists have managed(46). The technology will allow manufacturers to scan microchips for faults, as well as revealing microscopic defects in anything from aircraft to banknotes.
Gang Xiao and Ben Schrag at Brown University in Providence, Rhode Island, visualize the current by measuring subtle changes in the magnetic field of an object and(47)
Their sensor is adapted from an existing piece of technology that is used to measure large magnetic fields in computer hard drives. "We redesigned the magnetic sensor to make it capable of measuring very weak changes in magnetic fields," says Xiao.
The resulting device is capable of detecting a current as weak as 10 microamperes, even when the wire is buried deep within a chip, and it shows up features as small as 40 nanometers across.
At present, engineers looking for defects in a chip have to peel off the layers and examine the circuits visually; this is one of the obstacles(48). But the new magnetic microscope is sensitive enough to look inside chips and reveal faults such as short circuits, nicks in the wires or electro migration -- where a dense area of current picks up surrounding atoms and moves them along. "It is like watching a river flow," explains Xiao.
As well as scanning tiny circuits, the microscope can be used to reveal the internal structure of any object capable of conducting electricity. For example, it could look directly at microscopic cracks in an aeroplane’s fuselage,(49). The technique cannot yet pick up electrical activity in the human brain because the current there is too small, but Xiao doesn’t rule it out in the future. "I can never say never," he says.
Although the researchers have only just made the technical details of the microscope public, it is already on sale, from electronics company Micro Magnetics in Fall River, Massachusetts. It is currently the size of a refrigerator and takes several minutes to scan a circuit, but Xiao and Schrag are working(50).
A. to shrink it to the size of a desktop computer and cut the scanning time to 30 seconds
B. to making chips any smaller
C. to take tiny chips we require
D. to picture the progress of the currents
E. converting the information into a color picture showing the density of current at each point
F. faults in the metal strip of a forged banknote or bacteria in a water sample
选项
答案
B
解析
“obstacle to +名词性成分”的意思是“……的障碍”。
转载请注明原文地址:https://kaotiyun.com/show/oRhd777K
本试题收录于:
职称英语理工类基础题库职称英语分类
0
职称英语理工类基础
职称英语
相关试题推荐
PassiveSmokingIsWorkplaceKillerPressuremountedonBritainonMondaytotakeactionon(51)smokingwithnewresearchs
Hepurchasedaticketandwentuponthetopdeck.
Theauthormentions"pick-me-up"toindicatethat______.Theauthorofthispassageprobablyagreesthat______.
Thepassageindicatesthatancienttreatmentsforinjuryanddiseasewere______.Itisbelievedbyscientiststhattraditional
Theeffectofhigheroilpriceshasbeensubstantiallyoffsetbytherecentyenappreciation.
Primitivehumanslookedlikeanimals.Nowadays,peoplethinkillnessiscausedbyevilspirits.
AwithoutpityBsadandlonelyCemotionallyhealthyDwithoutrealloveforthemEasenseofsecurityFalonelywolfTheab
ThepassageindicatesthatancienttreatmentsforinjuryanddiseasewereItisbelievedbyscientiststhattraditionalmedicin
Marylookedpaleandweary.
TheRiverWensumflowsbyNorwich.Thefootballteamiscalled"TheCanaries"becauseofthecolourstheplayerswear.
随机试题
A.脂肪组织B.白质C.骨皮质D.胆固醇E.脑脊液T1WI为低信号T2WI为高信号
瓜藤缠的特征瘾疹的特征
胃阴不足型厌食证的首选方剂是久泻伤阴型泄泻的首选方剂是
常见的青紫型先天性心脏病是
会计核算软件按不同的适用范围可分为单用户会计核算软件和多用户(网络)会计核算软件。()
在视同买断方式销售商品的委托代销方式下,委托方确认收入的时点为()。
CFA证书由CFA协会授予,其获得者需为直接参与投资决策过程中各类人员,如基金经理、投资组合经理、财务分析师、策略师、经济学家、数量分析师等,并且还必须具备()年相关工作经验。
(2014年)在编制现金流量表时,下列现金流量中属于经营活动现金流量的有()。
NewYorkerswatchingthetelevisedbombingofBaghdadyesterdaysaidtheywererivetedbytherawand【1】displayofAmericanmili
CreativeBookReportIdeasA)Areyouatalossforcreativebookreportideasforyourstudents?Ifyes,thenthisarticlewill
最新回复
(
0
)